6151593991 has 4 divisors (see below), whose sum is σ = 6178693752. Its totient is φ = 6124494232.

The previous prime is 6151593977. The next prime is 6151593997. The reversal of 6151593991 is 1993951516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6151593991 - 2⁹ = 6151593479 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6151593997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13549540 + ... + 13549993.

It is an arithmetic number, because the mean of its divisors is an integer number (1544673438).

Almost surely, 2^6151593991 is an apocalyptic number.

6151593991 is a deficient number, since it is larger than the sum of its proper divisors (27099761).

6151593991 is a wasteful number, since it uses less digits than its factorization.

6151593991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27099760.

The product of its digits is 328050, while the sum is 49.

The square root of 6151593991 is about 78432.0979637801. The cubic root of 6151593991 is about 1832.2970737289.

The spelling of 6151593991 in words is "six billion, one hundred fifty-one million, five hundred ninety-three thousand, nine hundred ninety-one".